def onEnter(self, context):
super(self.__class__,self).onEnter(context)
assert self.draggableList.size() == 0
self.dropTargetClientWidth = DOMUtil.getClientWidth(self.dropTarget.getElement())
self.dropTargetClientHeight = DOMUtil.getClientHeight(self.dropTarget.getElement())
self.calcDropTargetOffset()
draggableAbsoluteLeft = context.draggable.getAbsoluteLeft()
draggableAbsoluteTop = context.draggable.getAbsoluteTop()
for widget in context.selectedWidgets:
draggable = self.Draggable(widget)
draggable.positioner = self.makePositioner(widget)
draggable.relativeX = widget.getAbsoluteLeft() - draggableAbsoluteLeft
draggable.relativeY = widget.getAbsoluteTop() - draggableAbsoluteTop
self.draggableList.add(draggable)
